Configuring Registers from SAM3X8E Flash Memory

Hello guys. I'm programming an Arduino DUE and I have to write and read on SAM3X8E flash memory through Arduino IDE. For instance, I tried to config EEFC_FCR register(from Enhanced Embedded Flash Controller) as follows:

EEFC_FCR = 0x01;

However, the IDE returned the following message:

"'EEFC_FCR' was not declared in this scope

In order to solve this problem I tried these solutions, although without success: - Use EEPROM.h library instead of writing/reading directly on registers, but that library is not compatible with Arduino DUE; - Add Arduino DUE board in Arduino IDE once again.

Can you help me? Thank you.